#include <pthread.h>
#include <stdlib.h>
#include <stdio.h>
void *thr_fn1(void *arg){
    printf("thread 1 returning\n");
    return (void *)1;
}

void *thr_fn2(void *arg){
    printf("thread 2 exiting\n");
    pthread_exit((void *)2);
}

int main(){
    int err;
    pthread_t tid1, tid2;
    void *tret;

    err = pthread_create(&tid1, NULL, thr_fn1, NULL);
    if(err){
        printf("pthread_create error\n");
        exit(0);
    }
    err = pthread_create(&tid2, NULL, thr_fn2, NULL);
    if(err){
        printf("pthread_create error\n");
        exit(0);
    }

    err = pthread_join(tid1, &tret);
    if(err){
        printf("pthread_join error\n");
        exit(0);
    }
    printf("thread1 exit, retcode:%lu\n", (unsigned long)tid1);

    err = pthread_join(tid2, &tret);
    if(err){
        printf("pthread_join error\n");
        exit(0);
    }
    printf("thread2 exit, retcode:%lu\n", (unsigned long)tid2);
    exit(0);
}